分割大文件为一定数量的小文件 对文件进行分割与合并的工具-Split large files for a certain number of small files Partition of the document and merge tools

java操作File的例子包括：操作Excel，文件读写、随机访问文件、分割大文件为多个小文件-Examples of java File operations: Operation Excel, the file read and write, random access files, split large files into smaller files